Introduce the function strip_path_suffix()

diff --git a/t/t4020-diff-external.sh b/t/t4020-diff-external.sh
index caea292f15437f50fd324496ff511971cc9d1d0c..281680d95afacb291d56d9d7f23efed1f3169e93 100755 (executable)
--- a/t/t4020-diff-external.sh
+++ b/t/t4020-diff-external.sh
@@ -128,4 +128,12 @@ test_expect_success 'force diff with "diff"' '
        test_cmp "$TEST_DIRECTORY"/t4020/diff.NUL actual
 '
 
+test_expect_success 'GIT_EXTERNAL_DIFF with more than one changed files' '
+       echo anotherfile > file2 &&
+       git add file2 &&
+       git commit -m "added 2nd file" &&
+       echo modified >file2 &&
+       GIT_EXTERNAL_DIFF=echo git diff
+'
+
 test_done